How do I deactivate True Wireless Stereo mode after two speakers were paired?

If you have connected a pair of speakers in True Wireless mode and you wish to unpair them, take the following steps:

  1. Unpair your smartphone, computer or Bluetooth device from the speaker(s)
  2. Press volume up and volume down buttons on both devices for about 3 seconds until you hear the jingle “True Wireless Off”

You’ll now be able to connect to each individual speaker and True Wireless mode won’t be active unless you pair the speakers again.

How do I tell the difference between AeroSkull XS and AeroSkull XS + ?

There are few ways you can tell the difference between the two models:

  1. Is the serial number of the two products is different:
    • AeroSkull XS – the fist few digits of the serial number will be either ML8004 or ML8005
    • AeroSkull XS + – the fist few digits of the serial number will be either ML8006 or ML8007
  2. The AeroSkull XS + does not have a line-out port.

How do I connect two of my AeroBulls to activate True Wireless Stereo mode?

Make sure your product is running the latest firmware and take the following steps:

  1. Power on one speaker first
  2. Put the speaker into left channel mode by holding down at the same time for about 3 seconds Volume down and Power button until you hear the jingle “Speaker Left”
  3. Power On the second speaker
  4. Put the speaker into right channel by holding down at the same time for about 3 seconds Volume up and Power button until you hear the jingle “Speaker Right”
  5. Wait a few seconds for the jingle “Device connected”
  6. Pair the Bluetooth device of your preference to the speaker and wait for the jingle “Device connected”
  7. You can now start the music streaming

How can I control the volume of my AeroSystem One without the remote control?

You can control the volume of the AeroSystem One using the button located at the top of the speaker.

Volume Down – Press and Hold the button on top of your AeroSystem ONE this will decrease the volume.

Volume Up – Press and Hold the button on top of the AeroSystem ONE, this will initiate the Volume Down, release the button and immediately repeat the same action, this will increase the volume.

How to upgrade the firmware of AeroSkull HD

Important: this is a Full System Update procedure

Note that the file name must be named askull.hex. The system will not recognise the file if it is named differently. If the file you have is named in a different way, rename it to askull.hex

Update procedure

For the steps of performing USB firmware update for MCU.

  • Plug the power supply into the unit.
  • Press the power button and hold it down for 5 seconds.
  • Release the button as soon as the white LED located between the glasses will flash slowly (~1Hz)
  • Connect the Thumb drive (USB Stick) containing the “.hex” file to the Micro USB – USB OTG cable.
  • Connect the OTG Cable to the Micro USB port of the AeroSkull HD
  • The Blue and White LED will flash alternatively until the software upgrade it completed.
  • Wait until the unit is up again and the LEDs stop flashing, the new firmware should be installed at this point.

How to verify Software version

Dock your iPhone / iPod on the AeroSkull HD

Tap the settings icon

Tap on General

Under General Tap About

Scroll down until AeroSkull HD

Tap on AeroSkull HD

Known issues

The white LED keeps flashing after I have plugged the OTG cable to the Micro USB port

Possible solutions:

  • Make sure the file is named correctly askull.hex
  • There should be no other file in the memory stick apart then askull.hex
  • Make sure your memory stick has been formatted as FAT32

How to upgrade my speaker’s firmware

Here are the system requirements for the upgrading your speaker’s software:

  • Microsoft Windows (compatible with 7, 8 or 10)
  • USB port on your computer
  • USB to micro USB cable
  • AeroUpdate application for your speaker’s model which you can download here.


  1. Plug your speaker to external power using the AC cord.
  2. Turn on the speaker and connect it to your Windows computer using Micro USB cable.
  3. Double click on the firmware upgrade and a Windows Wizard will guide you through the upgrade.